john gilmore wrote:
<snippage> 
>  
> but in, say. current PL/I the single scheme embodied in
>  
> example: procedure(parm) options(main) ;
>   . . .
>   declare parm character(*) varying2 parameter
>     nonassignable ;
> 
>   . . .
>  
> end example ;
>  
> is the only one supported,
<snip>

I believe other schemes are supported, as documented by:

http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/IBM3PG70/1.1.1.98?SHELF=IBMSH370
&DT=20081017082717

(Line wrap will occur, no doubt.  Search for "SYSTEM" in
the PL/I Programmer's Guide.)

Cheers,
Greg

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